I'm the owner of a newish 12 inch iBook, and I'm using Tiger 10.4.4, with 512 RAM. I'm wanting to know why the amount of free RAM drops so preciptiously with the use of a few programs and then can't be used again until the system is restarted. I start out with over 300 MBs and after using safari, iChat and iTunes, I can end up with just 150 or so with everything being closed. It's not the widgets, because even with those open, I still have over 300 to start, and I only have a few open at all (all small). Any ideas on what this is?